Picking mechanism for looms.



No. 812,485.- 'PATENTED FEB. 13, 1906.

H. A. DAVIS. MBGHANISM FR LOOMS.

APPIUATION funn Jnmf'al, 190s.

2 SHEETS-SHEET 1.

PFETBNTBD PEB. 13,y 19,06.

l H. A. DAVIS. PIKING MBCHANISM FR? IOlMSI.; APPLICATION FILED JULY 31,-19U5 2 SHEETS- SHEET 2.

UNITE-n STATES PATENT ,Prion yDRAPER COMPANY, oF ,HoPEDALEg PORATION, OF MAINE.

MASSACHUSETTS,` A COR- PIGKINGMECHANISM For-z Looms,l

Specification of Letters Patent. Application ned July si, 1905. Serin No. 271,875.V

Patented Feb.` 13, 1906.

To all whom it may concern:

Be it known that I, HARRY A. DAvIs, a

citizen of the United States, and a resident of Hopedale, county. of Worcester, and State of Massachusetts, have invented an Improvement in Pickin Mechanismfor Looms, of which the following description, in connection with the accompanying drawings,'is a specifi-' cation, like numerals on the drawings representing like parts. n

This invention relates to the picking mechanism of looms whereby the shuttle is thrown or picked back and forth through lthe shed;

and it has for its object the production of novel and effective means for imparting a more gradual and extended acceleration to the movement of the picker on fthe active stroke, while decreasing the power required to operate the shuttle. g.

In ordinary picking mechanism the revolving picking-cam has its impact-face'so shaped as to give the picker a very rapid but short acceleration on its active stroke, practically only'about fifty per cent. thereof. y When dealing with broad looms where the dshuttle travel is long, it is practically impossible to secure the desired acceleration vof the shuttle while in contact with the picker, because if movement oi' the picker on its active stroke f ofthe mechanism. In accordance with my4 present invention I have rovided means whereby' the desired gradual acceleration of is effected and through the'majorportion of such stroke, (in actualpractice about eighty per cent. thereof,) the results being secured without any increase in the shock or jar of the operating parts andwith a decreased expenditure of power. This is accomplished in the present embodiment of my invention by a cam when it coperates with the roll, such movement being compounded of a bodily-revolving motion of the cam about a fixed axis and an outward or substantially radial movement of the roll-engaging .portion of the cam with reference to its axis of revolution.

The various novel features of my invention will be fully described in the subjoined speciiication and particularly pointed out in the following claims.

Figure 1 is a front elevation of a loom picking mechanism embodying one form of my invention, it being understood that the picking mechanism is duplicatedv at each side of the loom. Fig. 2 is an outer 'side elevation of the picking-cam and the revolving carrier on which it is mounted as it would be seen when looking toward the right, Fig. 1, the means for eecting radial movement of the cam being shown 1n dotted lines and just at the instant such movement is to be effected. Fig. 3 is -a detail showing the picking-cam in its extreme outward position, the throw of the roll having been completed. Fig. -4 is a diagrammatic view showing the movement of the pick-roll per degree of revolution of the cam-shaft in the ordinary pick motion, and `Fig. 5 isa similar view showing the movement of the pick-roll in accordance with my present invention.

Referring to Fi 1, the loom sidel, rotate ing cam-shaft v2, t e oscillating stand 3, connected in practice with the lay rocker-shaft, (not shown,) the shoe 4, mounted to rock on the stand' in the direction Vof its length, the attached picker-stick 5, the picking-shaft 6, mounted to rock in bearings 7 on the loom side and provided with an arm 8, carrying the usual conical bowl or roll 9, and the connection 1() between the picking-shaft and the picker-stick 5 may be and are allsubstantially ofwell-known construction and operate in usual manner. In the present embodiment of my invention I mount the picking-cam on a circular or disk-like carrier 11, iixedly connected to the shaft 2 by means of a coupling 12, Fig. 1, having a hub 13 secured tothe shaft, the carrier having a segmental slot 14,

Fig. 2, to receive a clamping-bolt 15, which Vpeculiar movement imparted to the picking- IOO enters the coupling 12 at one side of the shaft 2. The opposite end 16 of the coupling (see Fig. 1,) bears against a set-screw 17, mounted in a lug 18 on the adjacent face of the carrier, so that by loosening the clamping-bolt 15 and turning the set-screw 1.7 the carrier can be adjusted angularly on the shaft 2.

and is at present vin common use to secure the picking-cam on -its shaft and to provide'for angular adjustment of the cam.

Near its peri hery the outer yface of the carrier is provi ed with a lateral stud 19, on which is pivotally mounted the picking-cam 20, said cam in general shape being substantially triangular and having an easily-curved roll-engaging portion 21 (see Fig. 2) extended beyond the periphery of the carrier. A projection or lug 26 on-the cam is normally held against the periphery of the carrier by a spring 27, fixed at one end to the carrierand at its other end fastened to an ear 28, forming one of the corners of the cam, and, referring to Fig. 2, it will be seen that bodily revolution of the cam about the axis of the shaft 2 would of itself cause comparatively slight movement ofthe r'oll, as the engaging ortion 21 is of a very gradual rise tothe igh point 22.

In order to increase the effectiveness of theA 4 tion, While the cam-face 21 is 1n engagement with the roll 9, the inner sidexof the cam 20 being provided with a toe 24, having a convexed impact-face 25, which is practically radial when the stop 26 is in engagement with the periphery ofthe carrier. This face is engaged by a trippin device, shownas a strong v and heavy cam or ug 29, formed on the hub- (See vfull like portion 30vof a bracket 31. lines, Fig. 1, and dotted lines, Fig. 2.) The cam-sha t 2 passes loosely through the hub 30, and the bracket 31 is bolted to the inner face ofthe loomwsid'e by suitable bolts 32..v

Referring to Fig. 1, it Will be seen that the hub is offset from the bracket, so that the-r picking-cam will clear the latter, theI lug ,or cam 29 projecting into the path of movement of the toe 24, as clearly shown in Fig. 2. The bolts 32 are extended through segmental 'slots'33 inthe bracket, (see Fig. so that the trip 29 can be set to meet the toe 23 `of the picking-cam earlier or later in the bodily revolution thereof. 1

As shown in Fig. 1, the outer corner of the the direction in which the cam-carrier 11,re volves,) it Will be seen that the fixed trip 29 is just about to be engaged by the face-25 of the toe 24, and when such engagement is effected the cam 20 is swung outward on its pivot 19With a gradual movement, While at the same time its bodily movement of revo- The Acoupling itself is not of my invention` lution continues. The compound movement of the cam thus produced moves its roll-engaging face 21 from the position shown in Fig. 2 to that shown in Fig. 3 by the time the point of the toe 24 has passed the point of the trip 29 and at the latter instant the `high point 22 of thecarn is leaving the roll 9. The described compound cam movement acts to give the roll a gradually-acceleratedmovement, as shown in Fig. 5, the acceleration increasing until about eighty per cent. of the movement of the pick-roll, and consequently the picker, has beenected, so that over three-fourths of the active stroke of the picker is performing useful Work as comared vvith only half of such stroke. (See Fig. 4.) The pick-shaft 6 partakes of the movement of the roll, and consequently the pact of the picking cam and roll is not harsh,

but, on the contrary, is relatively easy, reducing Wear and minimizing shock and jar, While the starting and gradual speeding up of the movement Aof the roll to the maximum is effected readily and eficiently. Manifestly the greatest Wear/will come on the impact-face of the cam-toe 25 and upon the trip 29 but as the contacting surfaces of both parts are large the Wear will not be rapid, and, furthermore, the Wear can be taken up by adjustment of the trip-carrying bracket.

Referring to Fig. 4, it will be seen that the 'speed of movement of the roll is rapidly accelerated up to about the middle `of its active stroke, so that the maximum speed of the picker is reached about mid-stroke, the speed gradually decreasing during the balance of the stroke, so that only about fifty per cent. of thestroke performs useful work. In Fig. 5 the acceleration is more gradual andl reaches its maximum when the active stroke is about eighty per cent. completed,

ICO

IIO

`to vthe bodily movement of revolution of the cam about such center, inasmuch as the movement is generallyA radial so far as concerns the roll-engaging portion of the pickin -cam.

y invention is not restricted to the precise construction and arrangement herein shown and described, as the same may be varied or modified in diiierent particulars-by those skilled in the art without departing from the s in't and scope of my invention.

' Having 'lly described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In picking mechanism for looms, a picking-shaft having an arm providedwith a roll, a picking-cam to coperate with the roll and rock said shaft, a revolving carrier on which said cam is pivotally mounted, and a`trip' to engage and rock the cam relatively to the carand move vthe latter with a gradual and eX- tended acceleration.

2. In picking mechanism for looms, a picking-shaft having an arm provided with a roll, a picking-cam to coperate with the roll and rock said shaft, a revolving carrier on which said cam is pivotally mounted, and a trip to engage the. cam and gradually throw it outward at a predetermined point in the revolution of the carrier, tocause the cam to act upon ythe roll byY the combined substantially termittent outward movement thereof relative to its axis ofrevolution, and a ickingradial and angular movements ofthe cam. 0 3. In picking mechanism for looms,a pickmg-shat having an arm provided with a roll,

,aifpicking-,cam to coperate therewith, and

nwieans to subject the cam to combined angularand substantially radial movement at the time?. of engagementwith the roll, to 'grad-l ually accelerate the movement of the roll through the maj or portion of its yactive stroke. 4. n picking mechanism for.looms, a picking-shaft having an arm-provided with a roll,^a revolving carrier, a picking-cam movablewith and also relatively to said carrier land adapted to coperate with4 the roll, and means to eect relative movement of the cam as the latilser is brought into engagementwith the ro 5. In picking mechanism for looms, a picking-shaft having an arm provided with a roll, a revolving carrier, a picking-cam movable with and also relatively to said carrier and adapted to coperate with the roll, a toe on the cam, a fixed trip to engage said toe and effect gradually-accelerated movement of the cam relative to the carrier when the cam engages the roll, and a sprin to restore the cam to normal position therea er'. i

\ 6. In picking mechanism for looms, a picking-shaft having an arm provided with a roll, a revolvlng carrier, a picking-cam movable withand also relatively to said-carrier and rier, to edect coperation ofthe cam and roll.

lto periodically adapted to coperate with the roll, and angularly-adjustable means toeectlmovement of the cam relatively to the carrier-when the cam vengages the roll, to gradually accelerate the movement ofthe roll and increase the eX- tent of such accelerated movement.'

7.' In picking mechanism for looms, a picking-shaft havin an arm provided with a roll, a revolving, dis like cam-carrier, a pickingcam pivotally mounted thereon and having a roll-engaging portion projecting beyond its periphery, and a fixed tri ping device toenga e the picking-cam an throw outward its rol -engagingportion, t6 effect a gradual and extended increase in the speed withwhich the picking-cam moves the ro l.

'8.' In picking mechanism for looms, a picking-shaft havin an' arm provided with a roll, a revolving, dis -like cam-carrier, a pickingcam pivotally mounted thereon and having a roll-engagingjportion, a stop on the cam, a springtoY actv uponsthecam-and-nermally retain t e stop in engagement with the periphery ofthe carrier, and a iiXedly-mounted trip engage the cam between its center of revolution and theL roll-engaging portion and move the latter outward to gradually increase thespeed of movement of the .roll when engaged by the cam.

9. In picking mechanism for. looms, in combination, a picking-cam, separate means to eect bodily revolution of said cam, and 1nroll with which the cam coperates w en subjected to such combined' movement.

10. In picking mechanism for looms, in combination, a revolving shaft, a carrier xedly mountedthereon, a picking-cam pivotally mounted on the carrier and having a IOO roll-engaging portion behind its pivot,-a camretractm sprmg, a iXedly-mounted trip to periodica ly engage the cam back of its plvot and throw its roll-engag' g (portion outward, anda pickin -shaft provide intermitting y acted upon by the. pickingcam.

with a roll to be i 11. In picking mechanism for looms7 in y combination, a picking-shaft havin an. arm

provided with a roll, a picking-cam avmg a roll-engaging portion, means to. bodily revolve t ecam about a fixed axis, a devlce to swing outward said cam from. its axis of revolution as it cooperates' with thelroll, and means `to angularly adjust the said device With relation to the axis about which the cam revolves bodily.

12. In picking mechanism for looms,- combination, a revolving carrier, a picking- .cam thereon having a roll-e a portion eliegi'lo, a pickadapted to gradually engag 1n -shat having an arm provided with said ro l, and means to move the cam relatively to its carrier to thereby causethe roll-engaging I to thereby correspondinglyact upon theshut- Io .portion to gradually increase the movement l' tlc through the picker-stick;

ol the roll due to cooperation with the cam. l In testimony whereof I have signed my 13. In picking mechanism for loon1s,1neans nemo to this specification in the presence of lo effect the throw of the shuttle, including a two subscribing witnesses.

pickerstick and an operativelywonnccted HARRY A. DAVIS. roll, and means to copcrate with the roll and Witnesses: I gradually accelerate the movement thereof CLARE H. DRAPER,

through the maj or portion of its active stroke, Y GEORGE Oris DRAPER 

